Garage door opener occasionally quits working. neither remote nor switches will activate the door. the door has power and you can hear a click, but nothing happens even after i disengage door. eventually, after I fiddle w/it, unplugging, wiggling wire, hitting weird button w/L.E.D. light - WHAMMY!!! it starts to work again! the only pattern is that that SEEMS to occur when it's real cold, but I could be imagining that as well. Sears Model 139.53515SR 0.5 hp, 6 A, 60 mhz